JP3876897B2 - Cable harness - Google Patents

Description

The present invention is bundled intermediate portion of the wire group including coaxial cable of a plurality of, about the cable harnessing scan having a connection terminal such as electrical connectors and circuit boards at both ends thereof.

  In recent years, with the spread of notebook computers, mobile phones, small video cameras, etc., in addition to the reduction in size and weight of these information communication devices, high-speed data transmission and higher density are required. In these communication devices, the liquid crystal display unit is normally configured to be foldable. For this reason, the electrical connection between the device main unit and the display unit is a wiring structure with rotation. Yes. In general, it is necessary to suppress the occurrence of electromagnetic interference (EMI) between circuits due to electromagnetic waves radiated from signal lines.

  In order to cope with this, a flexible substrate (FPC) that can be bent for circuit mounting and wiring in an apparatus is used. However, in addition to the conventional folding type, recently, an opening / closing / twisting type device has appeared, and generally the wiring length of the FPC becomes long, and it is difficult to minimize the ground potential. For circuit wiring using FPC, a solid ground structure having a ground conductor layer as a ground conductor layer is known as a ground conductor layer for securing a low resistance ground conductor and EMI countermeasures. The bendability is poor at the bent part, and cracks may occur and break.

  For this reason, it is known that slits are made in the ground conductor portion of the rotating portion, or that signal conductors and ground conductors are alternately arranged in a staggered manner to reduce ground conductor performance and ensure flexibility. (For example, refer to Patent Document 1). However, if the number of solid ground conductors is reduced in order to improve flexibility, the resistance value of the ground conductor increases and the ground potential rises, and there is a problem that the impedance mismatch of signals and EMI characteristics deteriorate. The wiring method using the FPC has not provided a satisfactory effective solution.

It is also known to use a bending-resistant shielded cable at a portion where the bending of a robot or the like is repeatedly applied to the wiring of the rotating portion using the FPC (see, for example, Patent Document 2). In the bending-resistant shielded cable disclosed in Patent Document 2, the outer periphery of a cable core obtained by twisting a plurality of counter wires having a shield layer is pressed and wound, a shield layer is provided on the outer periphery, and the outermost layer is covered with a jacket. Configured. And it is supposed that both the shield layer of an electric wire and the shield layer of a cable core can be formed by horizontal winding or a braided structure using a copper foil thread. However, it is only disclosed as a bend-resistant shielded cable, and its usage is not clear.
Japanese Patent Laid-Open No. 2004-88020 Japanese Utility Model Publication No. 5-38712

  In contrast to electrical wiring of rotating parts using FPC, recently, wiring is performed using a cable harness that bundles multiple ultra-thin coaxial wires around the part of a folding device such as a mobile phone that requires opening / closing and twisting. Is being considered. In the wiring system using this cable harness, the bending / twisting performance can be ensured for the time being, and there is no problem with respect to impedance matching and EMI due to the use of a coaxial line. However, since the coaxial wire used is usually a very thin wire having an outer diameter of 1 mm or less, the resistance value of the outer conductor is relatively large, and there is a problem that a potential difference occurs in the ground portion when the wiring length becomes long.

Therefore, in order to reduce the resistance of the outer conductor of the coaxial line, if the outer conductor size of the coaxial line is increased or a double structure is used, the bending / twisting performance deteriorates. Further, an attempt was made to wrap an FPC around the bundled coaxial line, or to cover it with a braided copper wire so as to be parallel, and to provide a low resistance conductor path in parallel with the outer conductor of the coaxial line. However, although the ground potential can be improved, the FPC breaks due to bending and twisting, and the braided conductor using the normal copper wire rubs the copper wire against each other by twisting, and the copper wire is broken. However, satisfactory results with respect to mechanical properties are still not obtained.
The present invention has been made in view of the above, while minimizing the ground potential of the outer conductor of the coaxial line, and challenges to provide a cable harnessing scan having a secure performance and durability against bending, twisting To do.

Cable harness according to the present invention, the intermediate portion of the wire group comprising a coaxial line which is insulated by the outside of the plurality of are bundled, have a connection terminal at both ends, is used in part with a closing-twisting devices it is a cable harness that. A braided sleeve made of copper foil yarn is arranged on the outer periphery of the electric wire group , and both ends of the braided sleeve are connected to the ground portion in the apparatus and are electrically connected in parallel with both ends of the outer conductor of the coaxial line. have.

  According to the present invention, impedance matching and EMI characteristics are ensured by the coaxial line, and the ground potential difference between the both ends of the outer conductor of the coaxial line is not impaired by the copper foil thread provided in parallel to the coaxial line. Can be reduced. Further, even if copper foil threads are rubbed against each other by bending and twisting of the cable harness, the cable harness is not easily cut and can have a durable ground conductor.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 (A) is a diagram for explaining an example of an ultrafine coaxial line used in the present invention, FIG. 1 (B) is a diagram for explaining the outline of a copper foil yarn used in the present invention, and FIG. 1 (C) is a copper foil yarn. It is a figure which shows the outline of the aggregate copper foil thread | yarn which bundled two or more. In the figure, 1 is a coaxial line, 2 is a central conductor, 3 is an insulator, 4 is an external conductor, 5 is a jacket, 6 is a copper foil thread, 7 is a high tensile strength fiber, 8 is a copper foil tape, and 9 is an aggregate copper. The foil thread is shown.

  As the coaxial wire 1 of the cable harness according to the present invention, for example, as shown in FIG. 1 (A), a central conductor 2, an insulator 3, an external conductor 4, and a jacket 5 are sequentially arranged coaxially from the inside. Is used. The center conductor 2 is formed, for example, by twisting seven copper alloy wires having an outer diameter of about 0.025 mm, and the outer surface is covered with an insulating material such as Teflon (registered trademark) resin to a thickness of about 0.06 mm. The insulator 3 is used.

  The outer conductor 4 disposed on the outer peripheral surface of the insulator 3 is formed, for example, by winding a copper alloy wire having an outer diameter of about 0.03 mm in a horizontal winding, and a polyester tape having a thickness of about 0.004 mm is formed on the outer surface thereof. A super-coaxial wire 1 having an outer diameter of about 0.3 mm is formed by stacking and fusing each other to form a jacket 5. The outer conductor 4 may have a braided structure instead of horizontal winding, or may have a structure in which a copper vapor-deposited tape is wrapped around the outer conductor 4. Also, in order to further improve the flexibility, bending and twisting characteristics of the coaxial line, the outer cover 5 may be coated with 0.03 mm thickness from a polyester tape with a Teflon (registered trademark) resin in the same manner as an insulator. is there.

  Moreover, the copper foil thread | yarn distribute | arranged along the electric wire group of the cable harness in this invention is a thing of a shape as shown in FIG.1 (B). This copper foil thread 6 is used for an earphone, a headphone, a curl cord of a telephone, and the like, and is known as a special conductor for communication having bending strength, flexibility and lightness. Further, as disclosed in Patent Document 2, it is also widely used as a shield conductor for cables.

  The copper foil yarn 6 is generally formed by wrapping a flat wire copper foil tape produced by rolling a round wire around a high strength fiber yarn 7 such as a polyester yarn. As the copper foil material, tin alloy copper or ordinary copper is used, and copper foil yarns 6 having an outer diameter of 0.11 mm and 0.25 mm are widely used. As shown in FIG. 1C, this copper foil yarn 6 can be used by twisting a plurality of copper foil yarns as an aggregate copper foil yarn 9, and by twisting a plurality of single-wire copper foil yarns 6, The strength can be increased and the resistance value can be lowered.

FIG. 2 is a diagram showing a reference example of an embodiment related to the present invention, and supplements the understanding of the present invention. FIG. 2A shows a state in which an electrical connector is connected to both ends of the electric wire group, and FIG. 2B is a diagram showing an example of a cable harness in which an aggregate copper foil thread is arranged. In the figure, 10a and 10b are electrical connectors, 11 is an electric wire group, 11a is an intermediate part, 11b is an end part, 12 is a binding tape, and other reference numerals are the same as those used in FIG. Is omitted.

This cable harness is intended for a configuration in which electric wires including a plurality of coaxial wires 1 are bundled to form an electric wire group 11, and connection terminals such as electric connectors 10 a and 10 b are provided at both ends 11 b of the electric wire group 11. The coaxial line 1 is a very thin coaxial line as described with reference to FIG. 1A, and the entire wire group 11 may be a coaxial line, but some of the wires other than the coaxial line not having an external conductor are included. It may be included. Moreover, although the electrical connector 10a, 10b is described as an example of the connection terminal, a printed circuit board may be used instead of the electrical connector, and the arrangement state of the wire group terminals so that the electrical connector can be easily attached later. There is also a form that holds.

  The plurality of coaxial wires 1 do not necessarily have the same length. However, for ease of manufacturing, the coaxial wires 1 are aligned in advance in a predetermined length, aligned in a parallel row at a predetermined pitch, and an adhesive tape (not shown) or the like is used. Thus, the electrical connectors 10a and 10b are connected while the arrangement of the coaxial wires 1 is maintained. After connecting the electrical connectors 10a and 10b, the adhesive tape is removed. For example, the electric wire group 11 separated by removing the adhesive tape is bent at an L-shape such that the connecting direction of the electrical connectors 10a and 10b is orthogonal to the longitudinal direction, and the intermediate portion of the electric wire group 11 is separated. 11a is bundled in a round shape with a binding tape 12 or the like. In addition, although the bundling of the intermediate part 11a may be performed over the full length, the form which is partial and intermittent may be sufficient.

The cable harness configuration described above above, as shown in FIG. 2 (B), before bundling the wire group 11 of the coaxial line 1, arranged in parallel along a plurality of sets copper foil yarn 9 to the coaxial cable 1 , And bundled together with a plurality of coaxial wires 1 with a binding tape 12. The ends 9a of the multiple copper foil threads 9 are divided into one or more and connected to the ground potential portion of the electrical connectors 10a and 10b, or a separately prepared ground terminal (not shown) is connected. Connect to the ground terminal provided in the device. In addition, although the figure showed the example along the coaxial line 1 with the form of the aggregate copper foil thread | yarn 9 which twisted the multiple copper foil thread | yarn, the untwisted single-wire copper foil thread | yarn is a coaxial line There is also a form of bundling so as to be united with the binding tape 12 along the line 1 .

  A plurality of aggregate copper foil yarns 9 arranged along the coaxial line 1 can be used as a low-resistance ground conductor connected in parallel to the outer conductor of the coaxial line 1. As a result, even if the harness length between the electrical connectors of the cable harness is long and a difference occurs in the ground potential at both ends of the outer conductor of the coaxial cable, the potential difference is caused by the copper foil ground conductor connected in parallel. Can be minimized (reduced) to a low potential.

Figure 3 is a diagram illustrating an embodiment of the present invention, FIG. 3 (A) shows a state in which a bundle of the intermediate portion of the wire group, FIG. 3 (B) was placed copper foil yarn in the form of a braided sleeve It is a figure which shows the example of a cable harness. In the figure, 13 is an insulating tape , 15 is a protective tape, 16 is a braided copper foil, and 16a is a copper foil terminal. Description of other reference numerals is omitted by using the same reference numerals as described in FIGS.

  In FIG. 3A, as described in FIG. 2A, after connecting the electrical connectors 10a and 10b to the both ends of the wire group 11, the intermediate portion 11a is bundled in a round shape and the insulating tape 13 is wound. Band together. The insulating tape 13 may be the same as the binding tape 12 of FIG. 2, but it is desirable that the insulating tape 13 has electrical insulation, and the form of being wound over almost the entire length of the intermediate portion 11a. preferable.

Subsequently to FIG. 3 (A), as shown in FIG. 3 (B), a plurality of copper foil yarns are arranged in a braided structure on the outer periphery of the insulating tape 13 in which the wire group 11 is bundled, and the copper of the braided sleeve The foil 16 is formed. Next, the protective tape 15 is wound around the outer surface of the braided copper foil 16 to prevent the braided copper foil 16 from being damaged by an external force, and the handling property at the time of assembling the equipment is improved.

The end 16a of the braided copper foil 16 is bundled in one or a plurality and connected to the ground potential portion of the electrical connectors 10a and 10b, or connected to a separately prepared ground terminal and provided in the device. Connect to the ground terminal. Incidentally, knitting Kumidohaku 16 may be formed on the outer periphery of the insulating tape 13 a bundle of electric wire group 11, but performs a direct braid on the electric wire group 11 without using an insulating tape 13, with its copper foil yarn The wire group 11 may be bundled. Also in this case, it is desirable to protect the braided copper foil 16 with the protective tape 15.

  The braided copper foil 16 described above is formed of only the copper foil yarn 6 shown in FIG. 1 (B), and the interwoven weave braided together with a fiber yarn such as a high-strength plastic yarn or an elastic rubber yarn. You may make it form with a structure. By adopting the union braided structure, it is possible to improve the wear resistance and the stretch property between the copper foil yarns of the braided copper foil, and it can be expected to further extend the life.

Ed Kumidohaku 16 disposed along the coaxial line 1 can be used as a ground conductor of low resistance which is connected in parallel to the outer conductor of the coaxial line 1. As a result, even if the cable harness is long and there is a difference in ground potential at both ends of the outer conductor of the coaxial line, the potential difference is minimized by the copper foil ground conductor connected in parallel. (Reduces) and can be set to a low potential. Also, knitted Kumidohaku 16 can also be used as a shield for the entire cable harness.

FIG. 4 is a view for explaining another embodiment of the present invention. FIG. 4 (A) shows a state in which an electrical connector is connected to both ends of the electric wire group, and FIG. It is a figure which shows the distributed cable harness example. In the figure, 10c and 10d are electrical connectors, 17 is an exposed portion of the outer conductor of the coaxial line, and the other reference numerals are the same as those described in FIGS.

Implementation form of this is an optional or outer conductor and the copper foil yarn coaxial line 1 at a desired site of the intermediate portion 11a of electric wire group 11 are electrically connected, minimal ground potential difference coaxial line outer conductor (Reduction) and low-resistance grounding. FIG. 4 shows an example in which electrical connectors 10c and 10d having shapes different from those in FIG. 2 or 3 can be used. In addition, the end portion 11b of the electric wire group 11 is not bent into an L shape as shown in FIGS. 2 and 3, and the end portion 11b of the electric wire group is narrowed in a fan shape with the original electrical connector attached. An example in which the intermediate portion 11a is bound is shown. In addition, when the harness length is short with this shape, it is necessary to consider that the length of the coaxial line 1 is different between the center portion and the end side. However, when the harness length is long, it is absorbed by the fan-shaped displacement portion at the end portion. Can be adjusted.

  In this embodiment, as shown in FIG. 4 (A), the outer portion of a desired portion (one or more) in the longitudinal direction is cut open at the intermediate portion 11a of the wire group 11 to expose the internal external conductor. . The external conductor exposed portion 17 may be subjected to a treatment (for example, application of a conductive paint, binding with a flexible conductor, etc.) such that when the wire group 11 is bundled, they are electrically connected and integrated with each other. it can. The electrical connectors 10c and 10d (or the printed circuit board) may be connected either before or after the external conductor exposed portion 17 is formed.

  Subsequently, as shown in FIG. 4B, the braided copper foil 16 is formed in the braided structure on the bundled intermediate portion 11a of the wire group 11 as described with reference to FIG. 3C, for example. . In this case, the electric wire group 11 is not bundled with the insulating tape, but the electric wire group 11 is bundled with the copper foil yarn that is directly braided. Then, the external conductor exposed portion 17 of the coaxial wire 1 formed in advance and the braided copper foil 16 are electrically connected using means such as conductive paint, solder, conductive band, or the like. Thereafter, as in the example of FIG. 3C, the protective tape 15 is wound around the outer surface of the braided copper foil 16 to protect the braided copper foil 16 from damage.

  The end 16a of the braided copper foil 16 is bundled in one or a plurality and connected to the ground potential portion of the electrical connectors 10a and 10b, or a ground terminal provided separately by connecting a separately prepared ground terminal. Connect to the terminal. Thereby, the braided copper foil 16 becomes a ground conductor connected in parallel to the outer conductor of the coaxial line 1. Even if the outer conductor of the coaxial line 1 is grounded by the electrical connectors 10a and 10b at both ends to be ground potential, if the harness length between the electrical connectors is long, there is a difference in ground potential between the intermediate portion and the electrical connector. May occur. However, as described above, the coaxial line is electrically connected to the braided copper foil 16 at a desired portion to obtain a ground potential, thereby reducing the ground potential difference as described above.

FIG. 5 is a diagram for explaining an example of a manufacturing method for manufacturing a cable harness according to the present invention, and is intended for manufacturing a cable harness having a shape having a braided copper foil as described in FIG. 3 ( B ). Is. FIG. 5A is a diagram in which a braided sleeve is continuously formed, FIG. 5B is a diagram in which the diameter of the braided sleeve is enlarged and covered on the cable harness, and FIG. FIG. In the figure, reference numerals 20, 20a and 20b denote braided sleeves, 21 denotes a sleeve forming core, and the other reference numerals are the same as those used in FIG.

  In the present invention, first, as shown in FIG. 5 (A), a sleeve core 21 having a predetermined diameter is prepared, and the copper foil yarn as described in FIG. A long braided sleeve 20 is continuously formed by bundling a plurality of bundles and knitting by a normal method. The shape of the braid is the same as that of a normal braid, and is formed by alternately braiding a plurality of copper foil yarns. The crossing angle θ in the longitudinal direction of the braid is preferably 60 ° or more in consideration of stretchability. The sleeve core 21 is extracted from the braided sleeve 20 after knitting and cut into a braided sleeve having a predetermined length.

  Next, as shown in FIG. 5 (B), the braided sleeve 20a cut to a predetermined length uses the stretchability of the braid to reduce the axial length and expand in the radial direction. What is necessary is just to select the magnitude | size of a diameter to expand, circular, and elliptical shape according to the magnitude | size and shape of the cable harness to mount | wear. In the cable harness, the electrical connector 10b is connected to both end portions 11b of the electric wire group 11 including the plurality of coaxial wires 1, and the intermediate portion 11a is bound with the insulating tape 13 or the like.

Subsequently, the braided sleeve 20a having an enlarged diameter is placed on the cable harness, and as shown in FIG. 5C, the braided sleeve 20a is stretched in the axial direction at an intermediate portion bound by the insulating tape 13. When the braided sleeve 20a having an enlarged diameter is stretched in the axial direction, the braided sleeve 20b covers the substantially entire length of the intermediate portion of the wire group 11 that is elongated and bound by the insulating tape 13 while being reduced in diameter. . The braided sleeve 20b having a reduced diameter is substantially the same as the braided copper foil 16 shown in FIG. 3 ( B ). The braided sleeve 20b is held so as to be in close contact with the intermediate portion bound by the insulating tape 13, and is protected by winding a protective tape around the outer side thereof.

  According to the method described above, the braided copper foil can be provided relatively easily on the outer periphery of the cable harness having connection terminals such as electric connectors at both ends. Then, the braided copper foil produced on the cable harness in this way is electrically connected in parallel with the outer conductor of the coaxial line, thereby preventing a difference in ground potential at both ends of the coaxial line. it can. In addition, when the braided copper foil produced using the copper foil thread was mounted at a length of 100 mm (0.015Ω) and twisted ± 180 ° by 120,000 times, the braided state was disturbed, but the copper There was no breakage in the foil thread. On the other hand, when the braided conductor formed using a normal annealed copper wire is similarly twisted 13,000 times with a mounting length of 100 mm (0.000045 Ω) and ± 180 °, the braided conductor is separated. As a result, disconnection also occurred and a predetermined twisting characteristic could not be obtained.

It is a figure explaining the example of the coaxial line and copper foil thread | yarn used for the cable harness of this invention. It is a figure which shows the reference example of the embodiment relevant to this invention. Is a diagram illustrating the implementation of the invention. It is a figure explaining other embodiment of this invention. It is a figure explaining an example of the manufacturing method which manufactures the cable harness of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Coaxial wire, 2 ... Center conductor, 3 ... Insulator, 4 ... Outer conductor, 5 ... Outer jacket, 6 ... Copper foil thread, 7 ... High tensile fiber, 8 ... Copper foil tape, 9 ... Aggregate copper foil thread, 10a to 10d ... electric connector, 11 ... electric wire group, 11a ... intermediate part, 11b ... end, 12 ... bundling tape, 13 ... insulating tape , 15 ... protective tape, 16 ... braided copper foil, 16a ... copper foil terminal, 17: External conductor exposed portion.

Claims (1)

The intermediate portion of the wire group comprising a coaxial line which is insulated with jacket a plurality of are bundled, have a connection terminal at both ends, a cable harness used in part with the closing-twisting devices,
A braided sleeve made of copper foil yarn is arranged on the outer periphery of the wire group , and both ends of the braided sleeve are connected to a ground portion in the apparatus and electrically connected in parallel to both ends of the outer conductor of the coaxial line. A cable harness having a ground connection part .

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